Electric switch.



1. FL MCELROY, DECD.

S. H. MCELROY. EXECUTRIX- ELECTRIC SWITCH.

APPLICATION FILED 'FEB. 27, 1912.

1 1 9 1 326. Patented J uly 18, 1916.

I3\ S I UNITED Y .STATES PATENT OFFICE.

.I eMES'F. MeE'LEo'YJ- or ALBANY, NEW YORK; SUSIE' H. MCELROY; ExECU/TEIX `OFSAID i-AMES fr: MeELRog, pECEiisED, AS'SIGNOR To CONSOLIDATED CAEHEATINGCOMI- 1 ANY,' A CORIORETION OF WEST VIRGINIA.

ELECTRIC SWITCH.

Application filed `February 2',V19 12. Serial No. 680,'230.

To aZZ'whom vt ma conce-rn.

a citizen-O the United States. residing at Albany, county of Albany,V State .of New York, have invented c eitain new yand use'- ful I'inprbveiliients in Electric Switch'esythe ollowing'being n fi'll, clear, and exact dis*- closureof the onet'oijiii of in v invention 'which atfpre'sent deinpreferable.

For 'a detailed' description ot" the present `form ofan'y invention, reference may be had to the following specification and to the accompanyiiig drawings, which `illustrate my' invention.

Figure l' is a vertical-section of my de# vice; Fig.l Qis a'lilan view thereof .wi'th vthe cover removed; Fig. 3 is afitontwiew there'- of with the casing in Section.

M v invention relates. to a switchl for an electric circuit and` a fluid-pressure device toropei'ating 1t.

Referring to the' drawing; the maincas ing for the switch, shown at-4l0, is ofsoniewhat cubicall shape with `an inwardly-extending-'guidbring 411 for the pistnrod The cylinder 41 is outside of said easing Yand screwed into a boss thereon opposite the said guide-ring.

At the outer en`d lof f cvlinder4-1 isa hollow casting. 401containing l able member is' an arched .'contact'-bar 50 contact ends a' A5 0 to'ft'he range 'of throw alchamber into which the compressed air enters. The piston 42 withl its .paelingfiiin 43' is pinned to the outer end of pistonfiod l44 wh-iehfpassesi through and i'sguided-by -ringJ 411. On the inner end 'of rod 41 is 35.7

secured-to the rod by a critter-13111.48 and mounted thecarrier' sleeve 45 detachably provided witlifa'clamp 49 for the arched contact-bar ot` tl ie"swit ch and alsolwitha radial rd 4T which loosely. engages guid rod 46 to pr ven-t axial rotation f the carriet',4 piston and piston' rod, It. till be Obwi h insulation except a't its a d 50" andisheld infthe aforesaid clam'p' 49 on the carrier 45. The stawhich is coated 4tionarycontaotterminals' are two in .nurn- 'bei' and each'is'in the formvof two looped `4"springs between 'which oneend of contact,-

bar 50 is gripped. A Tlius oneof the fixed the bar .into theterniinalsif f A 'desire to secure Specification OfLetter-s Patent. Fatentemeulyls terminals comprises the looped springs F51@ 555A and' vlb between which is gripped-'the Contact end o0 .of the bai' 50;" the other comprises the looped-springs 52a and52b1b'etween which is. frrippedthecontact end .50h ofthebar' o0. Each fixed contactterminal 'isinclosed in a .recess tornied of insulatingplates, one recess being iormed by plates 532 53") aiid the other byplates,54a, 54 (see Figs'. 2 and li'vithin these platesare v embedded the pole-pieces of the blow-out magnets, which are not shownin detail Since they form no part of my' 'presentinvention. The circuit,

entering 'by wire TQ, goes to wire '71 and thencethrougli one of the blow-Outmagnets to the terminal springs 51a land 511% ',Ihence, wlienithe circuit is closed, it passes by bar o0 to the terminal springsZa and 52h, and

the-n. after passing through the other blowout magnet, it goes by wire 72 to the out- ,By theairangeinent "above: described the piston 42. has a straight-line stroke which *drives 'the contact-bar 50 cirectly 'outward in a' straight lineto withdraw its en d's 50""L and 50b,.direct ly outward away from the .j'two fixed terminals to break the ,ciicuit. The' circuitwill Aremain closed .so long'as air pressure is maintained in cylinder 4l. vlien that pi'essureis released-a spring'GtL- ,interposed between .the radial i 'guidearm 47 and the casting40,\ co1nes into action and closes the circuitbydriving the barlf) into the grip of the `fixed terminals.

The radial 'rod' 47 insures accurate entry of contacts located within the recesses and eX- the character described 'tending'parallel with Said bars, a 'movable ycontact comprising an arched bar having end conta-cts' extendingapproximately at right ingles to .said inner 'wallsaiid Inov- 'able parallel therewith,. said. end cbntacts over-hanging said inner'walls', and means for reciprocating' said movable Contact.

y2. A switch of'the, character described comprising a casing provided'with spaced l aart 'elongated insulated recesses, station-4 recesses, a movable contactpcomprising an' arched bar having end contacts arranged at ary contacts parallel with the Walls 'of said right angles to the stationary contacts and lmovable parallel with the Walls of said recess, and means forl reciprocating said movvable contact longitudinally of said recesses.

A3. A switch of the character described comprising a casing provided With spaced -apart elongated insulating recesses, stationary contacts parallel With the Walls of ysaid recessesA amovablecontaet comprlsing an .arched bar the ends of which extend into the In Witness whereof haye hereunto @et 24th day of February, 1912.

litnessesz HEPBERT A. CAULKINS, CLARENCE PALMER.

. my' hand, before two subscribing Witnesses, this 20 JAMES F.' MCELRQY. i 

